Measuring and drawing instrument for making perspective pictures from nature



March 1929- H. HEHMSOTH 1, 06,229 MEASURING AND DRAWING INSTRUMENT FORMAKING PERSPECTIVE PICTURESFROM NATURE Filed Nov. 1, 1926 Patented Mar.19, 1929.

UNITED STATE PATENT QFFIQE.

HEINRICH HEHMSGTH, 0F BREMEN, GERMANY, ASSIGNOR TO HANS MEISSNER, OFBBEMEN, GERMANY.

MEASURING AND DRAWING INSTRUMENT FOR MAKING PERSPECTIVE PICTURES FROMNATURE.

Application filed November 1, 1926, Serial No. 145,602, and in GermanyOctober 31, 1925.

Measuring and drawing instruments for making perspective pictures, andwhich consist of a measure with stationary or movable protractor andpivotable arms, are known in many forms ot construction; with thesemeasuring and drawing instruments only one angle can be measured and,owing to the movable arrangement of the protractor, it is impossible tomount several arms on the instrument for measuring at the same timeseveral angles, and these instruments can further not be used as adrawing instrument on the drawing board. In other instruments it isimpossible to read downwardly directed angles situated underneath thehorizontal measure.

All these inconveniences are avoided according to the invention byproviding on the instrument, which consists of the rule-shapedhorizontal measure and of the semi-circular protractor fixed on saidmeasure, several pivotable arms of the same width as the ruler two ofsaid arms being extended beyond the pivot point. One of these twoextended arms is pointed at its rear end. said pointed end moving overthe scale of the protractor. The extended arm has an aperture at acertain distance from the pivot point. The other extended arm is movablymounted underneath the prot-ractor and it has near its end whichprojects over the protractor a marking line and on the other side of thepivot point a mark. The third pivotable arm serves to indicate theperpendicular line to the horizontally adjusted ruler.

Two proved rated which:

Fig. 1 shows the instrument with the pro tractor at the middle of theruler.

Fig. 9 is a similar view showing the proiractor at the left end of theruler.

T he protractor a is made in one piece with the horizontal measure 6. Ofthe three arms (Z, 0, f pivotably mounted on the pivot pin 0 the arms (Zand e are extended beyond embodiments of the instrument, imaccording tothe invention, are illusin the arr-ompanymg drawing. in

the pivot pin 0, the third arm reaching only to this pivot pin. Theextension of the arm (Z has a pointed end 73, which moves as pointerover the scale of the protractor. T he arm d has an aperture 2'- at ashort distance from and at the other side of the pivot pin and servingto view the direction of the arm of the angle which has to be measured.The arm 6 is mounted under the protractor and the end of its extensionbeyond the pivot pin 0 projects over the circumference of the protractorand has on the front end a marking line Z which moves along the scale onthe protractor. On the arm 6 a mark on is arranged.

As shown in the form of construction Fig. 2 the protractor a sits on theleft end of the measure the instrument being otherwise of a similarconstruction to that shown in Fig. l. The instrument shownin Fig. 2 isspecially adapted for workshops.

The manner in which the instrument is used need not be explained.

I claim An instrument for determining and reading perspective angles upto 360 and for facilitating the perspective drawing, comprising incombination a thin horizontal rule, a protractor at the middle of thelower edge of said rule, a pivot pin at the center of said protractor, athin rule for determining the perpendicular line pivotally mounted onsaid pivot pin under said protractor and having a mark on its uppersurface registering with the graduation on said protractor. a thin rulepivotally mounted on said pivot pin on said protractor having a viewingaperture and a pointed extension moving ver said prolractor. and asecond thin rule pivotally mounted on said pivot pin under saidPlflil'ilF-lfil' having an extension projecting over the circumferenceof said protractor and a mark registering with the graduation on saidprotractor said two rules with extensions designed for determiningprotractor angles.

In testimony whereof I affix my signature.

H. HEHMSOTH.

